Ornithischia

Ornithischia is a major clade of herbivorous dinosaurs distinguished by a backward-pointing pubis. It includes stegosaurs, ankylosaurs, ceratopsians, and ornithopods.

Dinosauria: Dinosauria is the clade of reptiles that includes birds and their extinct relatives. Ornithischia is one of the two major dinosaur branches alongside Saurischia.
Dental battery: A dental battery is a tightly packed set of teeth that function together as a grinding surface. Hadrosaurs developed extensive batteries for processing tough vegetation.
Stegosauria: Stegosauria is a group of herbivorous dinosaurs known for back plates and tail spikes. Stegosaurs are one of the major lineages nested within Ornithischia.
Eocursor: Eocursor is a small, early ornithischian dinosaur known from Late Triassic rocks of South Africa. Its fossils provide evidence for ornithischian anatomy near the clade’s early history.
Pubis: The pubis is one of three bones forming each half of the pelvis in most tetrapods. Its backward orientation is the defining skeletal feature of Ornithischia.
Hadrosaurid: Hadrosaurids are a family of duck-billed ornithopod dinosaurs known for complex teeth and diverse crests. Their jaws and dental batteries illustrate specialized ornithischian plant processing.
Ankylosauria: Ankylosauria is a group of armored herbivorous dinosaurs, often bearing a bony tail club. Ankylosaurs represent a heavily armored ornithischian branch.
Lesothosaurus: Lesothosaurus is a small early ornithischian dinosaur from the Early Jurassic of southern Africa. Its relatively complete skeleton helps document early ornithischian body form.
Predentary: The predentary is a small bone at the front of the lower jaw in ornithischian dinosaurs. This shared jaw feature helped support the clade’s characteristic cropping beaks.
Ceratopsia: Ceratopsia is the dinosaur group that includes horned ceratopsians and their close relatives. Its members evolved beaked jaws and, in later forms, shearing dental batteries.

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